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What is thought to be the heat source that drives convection currents in the mantle?

April 26, 2017convection currents drives heat Mantle source

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What is thought to be the heat source that drives convection currents in the mantle?

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The heat comes from a couple of different sources. The primary source is radioactive isotopes of various elements. As these decay, they release energy. The second source is the core. As the outer core cools and crystallizes, it releases heat that was stored in the liquid iron-nixkle. These are the two main sources of heat within the Earth’s mantle.